Which statement best explains the role of a
catalyst in a chemical reaction?
(1) a catalyst is added as an additional reactant
and is consumed but not regenerated.
(2) a catalyst limits the amount of reactants used.
(3) a catalyst changes the kinds of products produced.
(4) a catalyst provides an alternate reaction pathway
that requires less activation energy.

Fugu, also known as puffer fish, is a sushi delicacy that can also be lethal. puffer fish contain a powerful toxin that can kill an adult a few hours after ingestion. sushi chefs who prepare fugu must be specially trained because any contamination of the toxin-free areas of the fish can be deadly. recently this toxin has been put to good use, as scientists have discovered that a purified form of it can treat severe pain in cancer patients. this recent scientific discovery would fall under which area of chemistry? applied biochemistry pure organic chemistry pure physical chemistry applied inorganic chemistry

Upon decomposition, one sample of magnesium fluoride produced 1.65 kg of magnesium and 2.56 kg of fluorine. a second sample produced 1.32 kg of magnesium. part a how much fluorine (in grams) did the second sample produce?

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted